>> the neighbors did hear gunshots. >> she died in his arms. >> but everyone agrees on a simple tragic fact. on valentine's day, oscar pistorius shot and killed his girlfriend reeva steenkamp, leaving a family without their daughter and a nation without its hero. >> hello, i'm randi kaye, welcome to this special hour of "anderson cooper 360." millions of people around the world have been asking questions, arguing the evidence, riveted by every detail since that killing. those details emerged in sharp relief during a four-day court proceeding to determine whether the blade runner, oscar pistorius, remains free until trial. he will, but for three of those four days, it was hard to tell and impossible to turn away. in this hour, we're going to walk you through those days and what lies ahead.